Grinding-wheel.



A. W. BUFFER.

GRINDING WHEEL.

urnmuml FILED 1mm. 16. was.

Patented July 6,. 1909.

UNITED STATES A ENT OFFICE.

ALVIN W. PUFFER, OF MEDFORD, MASSACHUSETTS, ASSIGNOR TO PUFFER MANUFACTURING COMPANY, A CORPORATION OF MAINE.

GRINDING-WHEEL.

Specification of Letters Patent.

Patented July 6, 1909.

' Application filed March 16, 1908. Serial No. 421,344.

To all whom it may concern.

Be it known that I, ALVIN W. PUFFEn, a citizen of the United States, residing in Medford, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Grinding-VVheels, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representinglike parts.

The present invention relates to a grinding wheel, and is embodied in a carborundum wheel especially intended for use in cutting or grinding marble. I have discovered that marble can be rapidly cut away by the peripheral actionv of a carborundum wheel rotated at high speed, it being necessary, however, to keep the wheel cool in order to prevent the material used as a bond for the carborundum from disintegrating.

In cutting through a slab of marble, or in grinding down one edge of such a slab, the grinding action takes place entirely along theperipheryof the wheel, and it is necessary, therefore, to dissipate the heattalong that part of the periphery which is in actual grinding contact, in order to keep the grinding stone intact. Furthermore, in cutting through a slab of marble, it is obvious that the eriphery of the wheel is embedded in the mar lc as soon as the wheel'begins to cut, so that it is desirable to conduct a cooling medium, such as cold water,- to the bottom'of the channel where it will carry oil the heat as fast as generated. For this purpose, the

wheel embodying the invention is provided;

with means for conducting water continually to the working surface, the wheel being provided with channels leading from a portion of the wheel away from the art in grinding contact, where a stream oi water can be steadily su plied, to the said part in grinding contact, w 'ch is below the surface of the material being cut.

Figure 1 is a side elevation of a wheel embodying the invention, and Fig. 2 is an end view of the same.

Referring to Fig. 1, the wheel a is shown as.

4 operation, the principal grinding or cutting is -performedby the peripheral portion a? of the wheel which becomes embedded in the material operatedupon (indicated in dotted lines, Fig. 1, and designated by the reference character A) In order to keep that portion of the periphery a which is in actual grinding contact from becoming overheated, the wheel is provided with means for conducting a cooling medium such as cold water to the part of the Wheel which is in rinding contact with the material A, the wheel being shown as provided for this pu ose with channels a cut on the opposite sides of the wheel, the said channels beginning at a point near the middle of-the wheel and terminatin at the periphery thereof. The channe s are arranged alternately at opposite sides, so as to feed as many streams of water as possible toward the bottom of the out, without unduly weakening the material of which the wheel is made. By curving the channels, as indicated in Fig. 1, the rotation of ,the wheel tends to throw the water in the direction of rotation thereof, this configuration thus assisting in forcing the stream of water into the out where the actual grinding operation is takin place.

As best shown in Fig. 2, the staggered or alternate arrangement of the channels at opposite sides admits of the cutting of the c annels approximately half way through the wheel without unduly weakening t e same,fs0 that" the water distributing space afforded by the channels at opposite sides extends substantially wholly across the peripherypf the wheel.

Claim.

A grinding wheel having curved channels on opposite sides, said channels on one-side alternating in position with those on the o positc side, the channels being formed in t 0 surface of the wheel and extending from points near the middle of the wheel to the periphery thereof.

In testimony whereof, I have signed my name to this specification in .the presence of 

